@article{IM2_1973_7_3_a12,
     author = {N. V. Krylov},
     title = {On the selection of {a~Markov} process from a~system of processes and the construction of quasi-diffusion processes},
     journal = {Izvestiya. Mathematics },
     pages = {691--709},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1973_7_3_a12/}
}